Not good for Americans though since their electricity gets more expensive.
The practice known as curtailment, is a way for miners to help electricity grids. The miners' steady demand ensures power producers are bringing in revenue to offset costs, but can power off when demand from other sources is high, such as during winter storms.
Show me empirical evidence what you described is actually happening on a large scale.
Some countries have different prices for residential areas vs businesses vs industry.
For residential areas they might do something like first 10 kWh = $0.01/kWh, next 20 kWh = $0.02/kWh, etc. This punishes people who use excessive amounts and helps keep electricity affordable for people living in poverty.
It's the US's fault for not implementing something like that (and I'm one of the people living in it).
Small/medium mining operators just build in those cheapest locations.
The largest operations are turning towards purchasing or building their own capacity, some of which activity will still contribute to a supply/demand curve that raises prices for the entire country (or at least region). In some cases large mining companies have even recommissions old coal power plants, e.g., Marathon Digital Holdings w/ the Harding plant.